Panasonic’s new projector

In early September Panasonic is taking me and another Australia writer to the United States for the release of its new home theatre projector, the PT-AE900, in Hollywood. You can see my reviews of its predecessors, the Panasonic PT-AE700 here, and the Panasonic PT-AE500 here.

I’m quite keen on these projectors because they offer a level of performance for under $4,000 that was achievable only for more than $10,000 just a few short years ago. So I’m hopeful that the new Panasonic projector will be a further improvement for a similar price.

The only problem is that going to America is not a trivial undertaking for the likes of me. Now if I were going as a tourist, no problem. For Australian tourists, a visa waiver is granted upon entry. However journalists and writers must have a visa in order to enter the US. Molly Meldrum found out this to his distress a few years ago when he was stopped on entry, visa-less, and plonked onto the next plane coming back home.

Getting such a visa normally takes six weeks I’m told, but the US Consulate is kindly rushing mine through. Unfortunately, in addition to a couple of hundred dollars in charges (which Panasonic has rather nicely offered to pay), I have to present myself personally at the Consulate. Now since I’m in Canberra, the diplomatic capital of Australia, you’d think I could just lob up at the US Embassy. No, they don’t offer consulate services. So I have to go to Sydney for this. And get there before 11:45am on the appointed weekday, since they don’t do visas after lunch.

The good news is that once the visa is issued, it’s good for five years so I won’t have to go through this rigmarole again for a while.

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Letters to the Editor

Back before I started writing for a living, I wrote letters to newspaper and magazines of the whinging, complaining kind one still sees. For those interested, I’ve posted the ones that were published here.

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The power of selection

Darwinism is often the subject of disbelief because one of its two important components is overlooked. The essence of Darwinism is evolution through natural selection. This requires variation between organisms, and a method of selecting the most suitable variants from amongst them.

The variation is provided by various means: primarily the shuffling of the existing elements in the gene pool thanks to sexual reproduction, and by mutation. Both of these processes are more or less random, and in the case of mutation, far more likely to produce a broken organism than an ‘improved’ one (improved means better fitted for survival and reproduction in that organism’s environment).

It is the overlooked component, selection, that produces order out of the randomness. In the case of Darwinism, it is the environment which selects which randomly produced characteristics succeed and spread.

As a modest contribution to this debate, let me produce ordered sound from randomness. Here are the steps.

CoolEdit 2000 filter producing order out of chaosFirst, I used the computer program CoolEdit 2000 to produce ten seconds of ‘pink noise’. Pink noise is random noise in which the average level of frequencies in each octave is equal. Since octaves double in their range of frequencies as they proceed up through the scale, the average level of each frequency falls at the frequency increases. This happens at rate of three decibels per octave. Pink noise is closer to natural sounds (which tend to fall away at 6dB per octave) than white noise, in which the average level of each frequency is the same as every other level. We reviewers use pink noise a lot in our tests because of this closer correspondence to reality.

Then I applied a filter to this pink noise. This filter was my ‘selection’ mechanism. It eliminated (actually, reduced by up to 60dB) all the sound, except for that around the frequencies 80, 160, 320, 640, 1280, 2560, 5120 and 10240 hertz. You can see the filter setup in the accomanying graphic.

What do we find? What was previously somewhat bass heavy random noise has now become a musical tone. Don’t believe me? Download the MP3 files and listen for yourself. Each is 78.5kB in size.

pink.mp3‘ is the original pink noise. ‘pink filtered.mp3‘ is the same file, modified only by the application of the filter. (Right click on the link and choose ‘Save Target As …’)

So, yes, you can produce order from randomness by applying nothing more than a suitable selection mechanism.

Posted in Audio, How Things Work, Rant | Leave a comment

More DVD Reviews up

Here are another eight Region 4 DVD reviews, originally printed in Australian HI-FI:

Gattaca and The Truman Show
To Kill a Mockingbird and Pleasantville
Meet John Doe and Casablanca
Starship Troopers (original and Special Edition) versions.

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A proper understanding of Starship Troopers

Robert Heinlein’s 1958 novel Starship Troopers is totally misunderstood by many, not least the makers of the 1997 movie of the same name. Take the issue of race, for example. The movie features pasty white Casper Van Dien in the part of the main charater, Johnny Rico, when it was clear from the novel that Rico was Filipino. Dien’s Rico is smugly ambitious and self confident, the novel’s Rico is searching and strives, with the help of others, to overcome his self doubt.

Not least of Heinlein’s virtues was his ability to separate the important from the fashionable. His characters are more or less timeless — as a ‘coming of age’ story, Rico could have been in a character in a World War I story as easily as in this future war story. Yet — remember this is 1958 when it was written — fashion is treated as arbitrary, not fixed. There are references to tough men wearing makeup and hardened soldiers wearing ear rings.

For years I’ve been meaning to complete an essay on the way that the movie abuses the novel on which it was ‘based’ and on its own internal idiocies. Now I find that someone has done most of my work for me. Christopher Weuve has a fine analysis and defence of the novel against the mostly clueless criticisms levelled against it, and a decent takedown of the movie. Go to ‘Thoughts on Starship Troopers‘.

The essence of my criticism of the movie is that it is to the book what a movie of 1984 would be to George Orwell’s novel. If, that is, the movie had been made under Josef Stalin’s direction, had lifted the characters from the story but reversed their motivations, had made the society a model of benevolence, had Winston Smith correcting errors in past publications instead of falsifying them. Starship Troopers the movie (which Weuve would have liked to refer to as ‘Paul Verhoeven, Jon Davison, and Ed Neumeier’s Twisted Parody of a Book They Claim They Liked But Have Done Everything to Befoul’) is, in fact, a satire on the sentiments and themes of Starship Troopers the novel.

Finally, I would only add that Weuve is too mild in his criticisms of the movie’s science. He mentions the asteroid that smears Buenos Aires, having been propelled across the full width of galaxy, yet only glancingly strikes a spaceship. In fact, to traverse such a distance in the short time the war had been proceeding, the asteroid would have had to travel at many times the speed of light. And how the pilots of the spaceship noticed the approach of asteroid – sufficient gravitational tug to overcome their own artificial gravity and tilt the water in a glass by perhaps twenty degrees — is ludicrous, given that such a strong pull would have first been noticed by them being pulled off balance, the trajectory of their craft being pulled off course and so on. The asteroid would have been incapable, in any case, of exerting more than microgravitational forces. It takes a very big chunk of rock indeed for significant gravity. Even the moon can only manage one sixth of ours.

Other idiocies: the bugs shoot down spaceships by farting globs of stuff from their rear ends into the air. Good way of achieving escape velocity. The single nuke that our chaps use to close up a cave produces a ripple of explosions in the ground rushing towards the camera. And so on.

UPDATE (Thursday, 11 August 2005, 10:02 pm): See also my review of Starship Troopers written for Australian HI-FI.

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DVD Reviews beginning to appear

For the past few years I’ve been writing reviews for Australian HI-FI. Rather than let them merely die, I’ve started loading up onto this site. Just go here.

There are six reviews there now. But I’ve got another 42 which I shall upload over time, plus I do another review each month. So, to begin, we have Cruel Intentions, Dangerous Liaisons, Halloween, Halloween H2O, The Terminator and Terminator 2: Judgment Day.

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Should you wait for the right DVD?

Different qualities of 'His Girl Friday' I have previously made reference (Frankenstein and Metropolis) to cheap and nasty, and good quality, DVD releases. The other day I bought one of the latter to replace yet another of the former.

In this case it was His Girl Friday, a hilarious 1940 gabfest. The picture to the right shows the same frame grabbed from two different DVDs. The top one is from the Australian Rajon Vision release (under the branding ‘Saturday Night at the Movies’). The bottom is from the Columbia Classics release. The differences need hardly be pointed out. Even the grey-scale in the Columbia release is more neutral than the other. As for sharpness, well …

I should also note that while both are in PAL format, the Columbia Classics version has been freshly telecined for PAL, whereas the Rajon version seems to be a conversion to PAL from an NTSC source. Most of the frames show heavy interlacing, and the Rajon version is a few minutes longer (NTSC runs at the same speed as film, PAL 4% faster). For this demonstration, I actually picked a non-interlaced frame.

Zooming in on the Rajon version shows tiny skewed scan lines at many edges. This suggests to me that the source for the Rajon release was actually an NTSC VHS tape!

Oh, and the dialogue clarity (vital for a movie such as this) is hugely improved on the Columbia release.

So should you happen across a cheap DVD of a classic movie, should you buy it? Or wait until an original studio release comes out? Oh buy it of course! There is no guarantee a higher quality version will ever emerge!

Next good and bad DVD comparison: Todd Browning’s Freaks.

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Andre Norton dies, aged 93

When I was in my final year of primary school (aged around 11), I applied for a bursary (a kind of small scholarship). A teacher asked me about my reading habits and suggested that, for the purposes of winning the bursary, I was partaking of the wrong end of the library. That library had fiction at one end, non-fiction at the other. I was always at the latter end.

Duly directed, I scanned the books at the fiction end. The teacher had wanted me to read the appropriate fiction classics. Instead I looked for interesting novels. The two authors who I first came upon, and whose novels inspired in me a life-long love of reading, were Robert Heinlein and Andre Norton.

The former died in 1988. Now Norton has herself just passed away.

I failed to win the bursary. But having since read some of those classics, I’m glad I didn’t read them at that time. I may have gained the bursary, but may also have failed to learn to love reading. Thank you Andre Norton.

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Randi gets his teeth into audio mysticism

I am happy to report that James Randi, best known as the magician/skeptic/author who eviscerates prominent self-proclaimed mystics, also spends the odd moment on audio mystics. For example, here on Peter Belt.

Follow some of the links from that post.

Posted in Audio, Cables, Mysticism | Leave a comment

A-Weighting, the saviour of many a poor piece of equipment

The aim of makers of high fidelity audio equipment is — or at any rate, ought to be — to produce equipment that does not modify the signal, other than convert it (from a digital to analogue representation, or from electrical to acoustical action) or amplify it. One component of this is having a totally flat frequency response. It may seem odd, then, that much of the technical measuring of audio equipment involves shaping the measured frequency response, using A-weighting.

A Weighting filter curve The purpose of this is to provide a signal to noise ratio figure that more closely represents the human experience than a straight unfiltered measurement. The human ear is very much less sensitive to, for example, bass frequencies, than it is to midrange frequencies. Our ears are at their most sensitive around 3,000 to 4,000 hertz. A nasty noise produced by an amplifier in this range of frequencies is very much more intrusive than a deep bass hum.

It is hard to find on the Web precisely what action an A-Weighted filter has. Happily, Greg Borrowman, the editor of Australian HI-FI (for which I write), is a true gentleman. Having researched the matter and generated the curves, he has given me permission to provide them to the world via this site.

So, for the A-weighting curve alone, download this 31kB PDF. If you want to explore further, you can download this 43kB PDF which has the A, B, C and D weighting curves. The last is a doozie. Greg says of it:

It was apparently used when measuring noise in avionics applications, because it penalised engines with lots of output (noise!) in the speech area.

I shall have to set up a download page for this kind of thing. Shall do so in the next few weeks to avoid people having to search the Blog archives.

UPDATE (Tuesday, 22 February 2005, 9:22 am): Greg also forwarded the underlying data for these curves in text files. The data is the decibel offsets from a flat response at one third octave intervals from 10 to 40,000 hertz. I’ve taken the liberty of stuffing them into an Excel spreadsheet and graphing them, in case someone may prefer to fiddle with the raw data. Right-click here to download the spreadsheet.

Posted in Audio, General Tech, Imperfect perception, Testing | Leave a comment